RETA CARO UPDATED Exam Questions
and CORRECT Answers
Which refrigerant has the highest mass flow requirement at the same evaporator and
condensing temperature? - CORRECT ANSWER- CFC-12
which refrigerant is the first to be phased out by Montreal Protocol - CORRECT ANSWER-
CFC-12
As the ratio between the evaporator and condensing pressure increases - CORRECT
ANSWER- the theoretical discharge temperature increases
Under the Montreal Protocol - CORRECT ANSWER- as long as a technician does not
perform work on the refrigerant containing portions of a system they do not need to be
certified
Refrigerant leaks are detected using - CORRECT ANSWER- Either a sulfur stick on
ammonia or electronic leak detector for CFCs or HCFCs
the primary reason for concern about CFC-12 concentration in an engine room is -
CORRECT ANSWER- oxygen deprivation
the published lower explosive limit for ammonia is - CORRECT ANSWER- 16%
under normal conditions an ammonia vessel should only be filled to what percentage -
CORRECT ANSWER- 80%
which refrigerant can be detected by its odor even in low concentrations - CORRECT
ANSWER- R-717
Which refrigerant would have the lowest condensing pressure at 95 Degrees F - CORRECT
ANSWER- CFC-11
and CORRECT Answers
Which refrigerant has the highest mass flow requirement at the same evaporator and
condensing temperature? - CORRECT ANSWER- CFC-12
which refrigerant is the first to be phased out by Montreal Protocol - CORRECT ANSWER-
CFC-12
As the ratio between the evaporator and condensing pressure increases - CORRECT
ANSWER- the theoretical discharge temperature increases
Under the Montreal Protocol - CORRECT ANSWER- as long as a technician does not
perform work on the refrigerant containing portions of a system they do not need to be
certified
Refrigerant leaks are detected using - CORRECT ANSWER- Either a sulfur stick on
ammonia or electronic leak detector for CFCs or HCFCs
the primary reason for concern about CFC-12 concentration in an engine room is -
CORRECT ANSWER- oxygen deprivation
the published lower explosive limit for ammonia is - CORRECT ANSWER- 16%
under normal conditions an ammonia vessel should only be filled to what percentage -
CORRECT ANSWER- 80%
which refrigerant can be detected by its odor even in low concentrations - CORRECT
ANSWER- R-717
Which refrigerant would have the lowest condensing pressure at 95 Degrees F - CORRECT
ANSWER- CFC-11
